Service With A Smile

Fresh from his Twitter payday, Jack Dorsey looks to expand the reach of his payment system, Square

[Square is processing $15 billion a year]

The Harlem skin clinic on frederick Douglass Boulevard in New York City is not the first place you’d expect to run into Jack Dorsey. But on a snowy December afternoon, the 37-year-old CEO of Square and chairman of Twitter appears to be in his element far from San Francisco, where the two companies he co-founded are headquartered on adjacent city blocks. …